Time zone, Region, UTC picker

- Extract most common view related codes into BaseTimeZoneAdapter
  and BaseTimeZonePicker. Subclass handles the text formatting and
  order.
- Search view is added compared to previous version of time
  zone picker
- SpannableUtil is added to preserve spannable when formatting
  String resource.
- Fix the bug using GMT+<arabic> as time zone id. b/73132985
- Fix Talkback treating flags on screens as a separate element

Bug: 72146259
Bug: 73132985
Bug: 73952488
Test: mm RunSettingsRoboTests
Change-Id: I42c6ac369199c09d11e7f5cc4707358fa4780fed

src/com/android/settings/datetime/timezone/SpannableUtil.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.datetime.timezone;
+
+import android.annotation.StringRes;
+import android.content.res.Resources;
+import android.text.Spannable;
+import android.text.SpannableStringBuilder;
+
+import java.util.Formatter;
+import java.util.Locale;
+
+
+public class SpannableUtil {
+
+    /**
+     * {@class Resources} has no method to format string resource with {@class Spannable} a
+     * rguments. It's a helper method for this purpose.
+     */
+    public static Spannable getResourcesText(Resources res, @StringRes int resId,
+            Object... args) {
+        final Locale locale = res.getConfiguration().getLocales().get(0);
+        final SpannableStringBuilder builder = new SpannableStringBuilder();
+        new Formatter(builder, locale).format(res.getString(resId), args);
+        return builder;
+    }
+}